HYDRAULIC MACHINERY

the load may easily be manually moved in any direction. The mast is
provided with a counter-balance arm, and the absence of chains and ropes
makes its construction exceedingly simple.

Fig. 27 shows a movable portal crane with fixed rake but of the two-
powered type, the opening in the pedestal being large enough to allow a

Fig. 28.—Hydraulic Coaling Hoist

wagon to pass through loaded up to gauge limit. This crane moves on rails
by manual power. It will be observed that the cabin is fixed on the mast,
so that the driver has a complete view of the load under all conditions. In
movable cranes the connections are made by flexible pipes, mostly of the
armoured hose type.
Fig. 28 shows a coaling hoist of the suspended type, capable of dealing
with wagons having a gross load of 30 tons. The framing is constructed
of steel plates and angles with central guides, between which the cradle